A polar pattern is a circular graph that shows how sensitive a microphone is in different directions. Each “circular” division represents 5dB of sensitivity, so you can see where the microphone picks up the strongest to the weakest sounds at different points. On the graph below, 0 degrees shows the direction the microphone is facing. 90 and 270 degrees are the sides of the microphone and 180 de...

The neural basis of pattern recognition is a central problem in visual neuroscience. Responses of single cells were recorded in area V4 of macaque monkey to three classes of periodic stimuli that are based on spatial derivative operators: polar (concentric and radial), hyperbolic, and conventional sinusoidal (Cartesian) gratings. Of 118 cells tested, 16 percent responded significantly more to p...

We discuss recent models of chemical evolution in the developing and collapsing protostellar envelopes associated with low-mass star formation. In particular, the effects of depletion of gas-phase molecules onto grain surfaces is considered. We show that during the middle to late evolutionary stages, prior to the formation of a protostar, various species selectively deplete from the gas phase. ...

Accuracy of the object classification is depend upon the feature vector of the object. Poroscopy is the method of pattern matching of the fingerprint images based upon pores. Pores of the fingerprint image are extracted by using Marker Controlled Watershed Segmentation. The features of the pores are extracted by various methods which are rotation variant. To improve the accuracy of the pattern ...

APPLICATIONS J. A. Boluda1 F. Pardo1 T. Kayser2 J. J. P erez1 J. Pelechano1 1Institut de Rob otica. Universitat de Val encia, Val encia, Spain 2Fachhochschule Mannheim, Mannheim, Germany ABSTRACT A foveated camera has been designed and fabricated. The camera is implemented using a new foveated CMOS sensor which incorporates a log-polar transformation. This transformation has specially interesti...

Variations of the atmospheric angular momentum "AAM# is responsible for almost all of the observed length!of!day "LOD# variation on time scales from several days to several years\ and much of the observed polar motion on the intra!seasonal time scale[ El Nin1⁄2o:Southern Oscillation "ENSO# and Quasi!Biennial Oscillation "QBO# have been singled out to successfully explain interannual LOD variati...

[1] We present observations of seasonal variations in polygonal crack patterns located in a polar trough on the south polar cap of Mars; previously, there was no direct observation showing that these patterns change. Polygonal patterns on Mars are attributed to thermal contraction cracking, which is commonly observed in periglacial environments on Earth. In this paper we discuss observations ba...

As hernia mesh implants are used to reinforce the abdominal wall, several complications can occur, such as recurrence, pain, seroma formation and infection, depending on their biocompatibility. The polymer coated knitted is repair hernias by providing a flexible scaffold. objective of this study was assess skin sensitisation potential polar non-polar extract In Vitro degradation Vivo pattern fo...

[1] The time-variable structure of Ganymede’s magnetosphere is studied by means of resistive MHD simulations. Using the magnetometer measurements of the Galileo spacecraft in the first few Ganymede flybys as examples, we find that the plasma flow pattern inside the Ganymedian magnetosphere could be subject to significant changes. Furthermore, the boundary of the polar cap dividing the open magn...

In this paper, polar and spherical Fourier Analysis are defined as the decomposition of a function in terms of eigenfunctions of the Laplacian with the eigenfunctions being separable in the corresponding coordinates. Each eigenfunction represents a basic pattern with the wavenumber indicating the scale. The proposed transforms provide an effective radial decomposition in addition to the well-kn...